Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26at...24..241p&link_type=abstract
Astronomical and Astrophysical Transactions, vol. 24, Issue 3, p.241-252
Astronomy and Astrophysics
Astronomy
Orbits, Disc Galaxies, Dense Nucleus, Galactic Models
Scientific paper
An axially symmetric galactic dynamic model is used, with a disc, a massive nucleus and halo components, in order to reproduce recently obtained observation data in disc galaxies. The model reproduces very well two basic physical quantities, i.e. the high-velocity rotation and the high surface mass density in the central regions of some galaxies such as the galaxy NGC 3079. Going a step further, we investigate the properties of orbits in the model, the behaviour of the velocities of the system and their connections with the value of the conserved Lz component of the angular momentum. The regular or chaotic nature of motion is also studied. All the above studies are made in two different cases: firstly, when the model is time independent and, secondly, when the model evolves with time.
Caranicolas Nicolaos D.
Papadopoulos N. J.
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